Felt-whipper.



B. n. COP PAGE.

FELT WHIPPER.

APPLICATION FILED MAR. 4, 1915. 1,145,40K Patented July 6, 1915.

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Ell f W/T/VESSES: 69 Q. 3% m A orrion BENJAMIN DENVER COPPAGE, O F WILMINGTON, DELAWARE.

FELT-WHIPPER.

To all whom it may concern:

Be it known that I, BENJAMIN DENVER CorPAen, a resident of Wilmington, Delaware, (whose post-oflice address is care of The Pusey & Jones Company, Wilmington, Delaware,) have invented a new and useful Improvement'in F elt-WVhippers, which in vention is fully set forth in the following specification.

This invention is an improvement in the construction of felt whippers which are used in paper making machines to remove accumulation of stock, filler, etc., which tends to close the meshes of felts.

The so-called felts of paper making machines are endless belts which support and convey the paper during certain steps of its formation. More particularly in a Fourdrinier machine, such felts receive the wet paper after it leaves the wire and convey it between pressure rollers which squeeze out water and finally deliver the paper to the drying cylinders. The initial cost of felts is considerable, and being relatively short lived, they constitute an item of much expense in the running of a paper making machine. The period of effective use of wet or press felts is measured by their ability to withstand chemical action and mechanical stress, both of which are unavoidably present. The utmost care should be exercised to keep them at a minimum for they soon destroy the felts even under most favorable conditions.

The presence and preservation of the nap on a felt is essential to its efficient operation, for a felt which is threadbare, either uniformly over its surface, or in spots or streaks, produces an imperfect paper. At one or more points in its path of travel, the press felt is acted upon by the so-called felt whipper which acts to shake loose and remove accumulations of stock, filler, etc., which have lodged in the felt and tend to close the meshes of the same. Felts are frequently injured and their nap removed by felt whippers such as are commonly employed. These whippers, when made of wood, may become rough, caused by raising the grain of the Wood when wet, or they may present sharp edges, as by the loss of plu s placed over the heads of bolts used in fastening the whipper bars in place. From causes such as these thejnap is re- Specification of Letters Patent.

Patented July 6, 1915.

Application filed March 4, 1915. Serial No. 12,152.

moved from the felt. The felts should be reversed daily after washing to remove accumulated filling or dirt, and also to present a fresh face to the paper-to be carried; but obviously, if one face of the felt becomes m ured or marred by a defective whipper surface, reversal of the felt is impossible and therefore the entire wear falls upon the good face of the felt. I

With these considerations in mind, the objects of the present invention are to provide a felt whipper having felt-engaging surfaces which are uniformly smooth and imperforate with no irregularities or edges which might act to mar or injure the felt, said felt-engaging surfaces being readily put in place and removed, and being securely held in position on the whipper bars without the aid of rivets, screws or the like retaining means.

A further object of the invention is to provide such felt-engaging surfaces with a close-fitting frame support on the whipper bars, the construction of the support and the felt-engaging surface being such that the latter maybe put in position and removed from the whipper bars by a sliding longitudinal movement.

The invention will be better understood by reference to the accompanying drawings, wherein Figure 1 is a perspective view showing a felt whipper provided with two whipper bars, a felt being shown in association with the mechanism; Fig. 2 is a transverse sectional view through the felt whipper, showing the close engagement between the feltengaging surface and its support on the whipper bar; Fig. 3 is a similar sectional view showing one method of securing the whipper bars to the shaft on which theyare mounted; and Fig. 4 is a modification.

Referring to the drawings, wherein like reference numerals indicate like parts, 5 indicates a shaft that is mounted in suitable bearings 6 and 7, said bearings being mounted, respectively, on bases 8 and 9. The shaft 5 is rotated in any suitable manner, as means of a power driven belt 10 passing around a] pulley 11 mounted on one end of said shaft. The whipper bars may be secured to the shaft 5 in any suitable manner. As shown in Fig. 3 a bolt 12 provided with a head 13 and a nut 14 passes through two Whipper bars 15 and 16 and through the shaft 5 and securely holds the parts in position. Preferably two or more of such bolts 12 are employed, one near each end of the Whipper bars and another at an intermediate position. It will be observed that the inner edges of the Whipper bars are curved at 17 to conform to the shape of the shaft 5, and that the head 15 of the bolt and the nut 1% are contained in recesses provided in the outer edges of the Whipper bars. A washer 18 is preferably introduced between head 13 of the bolt and the bottom of its associated recess and a washer 19 is preferably introduced between the nut 14 and the bottom of its recess.

The felt-engaging surface that is employed is shown in the form of a sheathing of interrupted tubing 20, which sheathing is of brass or other suitable composition. As shown in Fig. 2 the outer edge of each of the Whipper bars is convexly curved at 21, the curvature of this portion of the Whipper bars corresponding in cross section to that of the felt-engaging surface or sheathing of interrupted tubing. Preferably this sheathing is made from standard tubing from which a section has been removed. T he sheathing 20 is readily slid on to its curved support on the outer edge of its associated Whipper bar and, in view of the fact that the neck 22 of the bar is narrower than the interior diameter of the sheathing, the latter is firmly held in place and cannot be accidentally removed by the action of centrifugal force.

In the construction shown in Figs. 2 and 3, the Whipper bars 15 and 16 are of wood and the sheathings 20 are placed in position when the wooden bars are dry. The fit between the supporting surface 21 and the sheathing 20 is a close one, but after the wooden bars are wet they swell and the sheathings fit them even tighter, which prevents any accidental longitudinal movement of said sheathings. When it is desired to replace one of these sheathings, it can be readily effected by sliding the same longitudinally off of its supporting surface on the Whipper bars.

In Fig. f there is illustrated a construction of whipper employing three whipper bars 23, 2 1 and 25. These bars constitute a spider which is mounted on a hollow shaft 26which carries a plurality of such spiders. Each of these bars terminates in ametal part 27, preferably of steel, which is circular in cross-section and which is held securely in place by means of a spindle 28 which passes through an opening in said part, the outer end of said spindle being upset or riveted in a countersunk part of said opening. These parts 27 constitute a firm support for the sheathings 20, which sheathings closely engage the said parts, and

rivets, screws or the like, and that a firm support is provided for said felt-engaging surfaces, said surfaces or sheathings closely fitting said supports whereby accidental displacement of' the former is practically impossible.

While for the purpose of illustration two expressions of the inventive idea have been shown and described, it is to be understood that the invention is not limited to these constructions but that the inventive idea is susceptible of various mechanical expressions within the limits of the appended claims.

What is claimed is 1. In a felt Whipper, the combination of a plurality of Whipper bars, the outer extremity of each of which is convexly curved, and a sheathing of interrupting tubing for each bar, the interior of each tubing closely engaging the curved extremity of its bar.

2. In a felt whipper, the combination of a plurality of Whipper bars, the outer extremity of each of which is convex-1y curved, and a sheathing of interrupting tubing for each bar, the interior of each tubing closely engaging the curved extremity of its bar, and each sheathing being longitudinally displaceable along its bar.

3. In a felt Whipper, the combination of a plurality of Whipper bars, the outer extremity of each of which is convexly curved, and a sheathing of interrupting tubing for each bar, the interior of each tubing closely engaging the curved extremity of its bar, said members being forced into more intimate contact after said sheathing is in place.

4. In a felt Whipper, the combination of a plurality of Whipper bars, the outer ertremity of each of which is convexly curved, and a sheathing of interrupted tubing for each bar, said sheathing having the same shape in cross-section assaid extremity whereby a close fit is provided between the sheathing and Whipper bar.

5. A felt Whipper having a plurality of wooden Whipper bars, the extremities of which are convexly curved, and a sheathing of interrupted tubing for each of said bars having the same shape in cross-section as said curved extremities, said wooden bars being swelled after the sheathings are in place.

6. A felt whipper having a plurality of whipper bars, each of which 1s provided with a sheathing of interrupted tubing the working face of which is smooth and imperforate.

7 A felt whipper having a plurality of Whipper bars, the extremities of which are curved, and a sheathing of interrupted tubing for each of said bars, said sheathing having the same shape in cross-section as 10 the curved extremity on which it is mounted. In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

BENJAMIN DENVER COPPAGE. Witnesses:

H. J. FEENEY, EDWARD MARTIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

